charcoal/OpenGLEngine/MyBuiltinCubeScene.cpp

#include "MyBuiltinCubeScene.h"

#include "MeshFactory.h"

MyBuiltinCubeScene::MyBuiltinCubeScene(Application& application)
	: BasicScene(application),
	m_shape(MeshFactory<BasicVertex, BasicIndex>::gen(
		DrawMode::DRAW_TRIANGLES,
		BasicVertex({ -50.0f, 50.0f, 0.0f }),
		BasicVertex({ 50.0f, 150.0f, 0.0f }),
		BasicVertex({ -100.0f, -50.0f, 0.0f }),
		BasicVertex({ 100.0f, -50.0f, 0.0f })
	), DrawMode::DRAW_TRIANGLES),
	m_camera(m_screen_size),
	m_batch(add_batch(&m_shape, 2))
{
	add_prerenderable(&m_camera);
	set_camera(&m_camera);
}

void MyBuiltinCubeScene::update(float delta_time, clock_t clock)
{
	float brightness;
	float radians;

	clock_t c;
	const clock_t intervals = 512 * CLOCKS_PER_SEC / 100;
	const clock_t half_interval = 256 * CLOCKS_PER_SEC / 100;
	c = clock % intervals;
	if (c < half_interval)
		brightness = (float)c / half_interval;
	else
		brightness = (float)(intervals - c) / half_interval;

	radians = (float)TAU * c / intervals;

	{
		Poseable& pose = m_batch.get_pose(0);
		pose.update_position(vec3(cos(radians) * 50, 0.0f, 0.0f));
	}

	{
		Poseable& pose = m_batch.get_pose(1);
		pose.update_position(vec3(0.0f, sin(radians) * 50, 0.0f));
	}

	vec2 camera_translation(0.0f, 0.0f);

	if (m_input_manager.is_key_down(GLFW_KEY_W)) camera_translation.y += 1;
	if (m_input_manager.is_key_down(GLFW_KEY_S)) camera_translation.y -= 1;
	if (m_input_manager.is_key_down(GLFW_KEY_A)) camera_translation.x -= 1;
	if (m_input_manager.is_key_down(GLFW_KEY_D)) camera_translation.x += 1;

	m_camera.translate(camera_translation * delta_time * 100.0f);
}